Positive and negative ion desorption chemical ionization of some penicillins
โ Scribed by John L. Gower; Claude Beaugrand; Claude Sallot
- Publisher
- John Wiley and Sons
- Year
- 1981
- Tongue
- English
- Weight
- 389 KB
- Volume
- 8
- Category
- Article
- ISSN
- 1076-5174
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## Matrix -assisted laser desorption/ionization (MALDI) mass spectrometry (MS) of oligosaccharides and polysaccharides has been investigated in detail. It is demonstrated that cationized species of oligosaccharides, [MNa] and [MK] , are dominant products under the MALDI condition, and negative ion
## When is used as a reagent gas for negative-ion chemical ionization (NCI) of phenothiazines and related com-O 2 pounds, the majority of the ions observed are formed by surface-catalyzed reactions prior to ionization. Both oxidation of the sulfur atom and formation of quinoid systems are observed